There is a 1987 Audi 80 B3 (Typ 89) (3 stars***) in Die Ludolfs - 4 Brüder auf'm Schrottplatz
http://www.imcdb.org/movie_1056152-Die-Ludolfs-4-Bruder-auf-m-Schrottplatz.html?PHPSESSID=1d6a7eee3309b920556100b063031301

Again...

2005 Audi A6 3.2 FSI quattro C6 (Typ 4F) (2 stars**)

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@walter: inm one episode they have bought an Typ 44 Audi 100 Avant 2.3, because it was the favourite car o the brother, who is always sitting at the phone.
After they have found out, that the Turbo was broken, they made their own little stock car-race and have crashed it into a Fiat Panda.
The brother, who has expected his own dream car, was totally pissed.

Thanks for the info Ingo
I'll find this episode